The freedom to study how the program works, and adapt it to your needs
The freedom to redistribute copies so you can help your neighbor
The freedom to improve the program, and release your improvements to the public, so that the whole community benefits
You are not required to accept the GPL to receive or run a copy of Strongwind, but if you must accept the GPL to redistribute or modify Strongwind. The main conditions of the GPL are:
You must conspicuously and appropriately publish on each copy distributed an appropriate copyright notice and disclaimer of warranty and keep intact all the notices that refer to the GPL and to the absence of any warranty. You must also include a copy of the GPL with each copy of Strongwind.
If you modify your copy or copies of the program or any portion of it, or develop a program based upon it, you may distribute the resulting work provided you do so under the GPL.
If you copy or distribute the program, you must accompany it with the complete corresponding machine-readable source code or with a written offer, valid for at least three years, to furnish the complete corresponding machine-readable source code.